Java sql.Time toString()方法与示例
toString()java.sql.Time类的方法以String变量的形式返回当前Time对象的时间的JDBC转义格式。
即使用此方法可以将Time对象转换为String。
//Retrieving the Time object
Time timeObj = rs.getTime("DeliveryTime");
//将Time对象转换为String格式
String time = timeObj.toString();示例
让我们使用CREATE语句在MySQL数据库中创建一个带有名称调度的表，如下所示：
CREATE TABLE dispatches( ProductName VARCHAR(255), CustomerName VARCHAR(255), DispatchDate date, DeliveryTime time, Price INT, Location VARCHAR(255));
现在，我们将使用INSERT语句在分派表中插入5条记录-
insert into dispatches values('Key-Board', 'Raja', DATE('2019-09-01'), TIME('11:00:00'), 7000, 'Hyderabad');
insert into dispatches values('Earphones', 'Roja', DATE('2019-05-01'), TIME('11:00:00'), 2000, 'Vishakhapatnam');
insert into dispatches values('Mouse', 'Puja', DATE('2019-03-01'), TIME('10:59:59'), 3000, 'Vijayawada');
insert into dispatches values('Mobile', 'Vanaja', DATE('2019-03-01'), TIME('10:10:52'), 9000, 'Chennai');
insert into dispatches values('Headset', 'Jalaja', DATE('2019-04-06'), TIME('11:08:59'), 6000, 'Goa');接下来的JDBC程序建立与数据库的连接，并检索调度表的内容。
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Time;
public class Time_toString {
public static void main(String args[]) throws SQLException {
//注册驱动程序
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//获得连接
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//创建一个Statement对象
Statement stmt = con.createStatement();
//查询以检索调度表的内容
String query = "select * from dispatches";
//执行查询
ResultSet rs = stmt.executeQuery(query);
while(rs.next()) {
System.out.println("Product Name: "+rs.getString("ProductName"));
System.out.println("Customer Name: "+rs.getString("CustomerName"));
System.out.println("Dispatch Date: "+rs.getDate("DispatchDate"));
Time timeObj = rs.getTime("DeliveryTime");
//将Time对象转换为String格式
String time = timeObj.toString();
System.out.println("Delivery time in String format: "+time);
System.out.println("Location: "+rs.getString("Location"));
System.out.println();
}
}
}在这里，在此程序中，在检索列值时，我们已使用toString()Time类的方法将DeliveryTime值从Time对象转换为字符串格式，并显示了它。
输出结果
Connection established...... Product Name: Key-Board Customer Name: Raja Dispatch Date: 2019-09-01 Delivery time in String format: 11:00:00 Location: Hyderabad Product Name: Earphones Customer Name: Roja Dispatch Date: 2019-05-01 Delivery time in String format: 11:00:00 Location: Vishakhapatnam Product Name: Mouse Customer Name: Puja Dispatch Date: 2019-03-01 Delivery time in String format: 10:59:59 Location: Vijayawada Product Name: Mobile Customer Name: Vanaja Dispatch Date: 2019-03-01 Delivery time in String format: 10:10:52 Location: Chennai Product Name: Headset Customer Name: Jalaja Dispatch Date: 2019-04-06 Delivery time in String format: 11:08:59 Location: Goa